The radiology corner: Longitudinal fistulous tract of the colon and a perianal fistula in diverticulitis.

Diverticular disease may mimic many of the symptoms and signs of Crohn's disease. The presence, however, of perirectal involvement and a longitudinal fistula greater than 10 cm. in the wall of the colon are two unusual features of diverticular disease. Discussed herein is a patient who presented with both of these complications.